I have a border collie, aged about nine. DS1 just took her out for a pee and she collapsed, shaking, her eyes rolling. She was "out" for maybe a minute, is now back to normal but is panting (it's not that hot here) and her belly is hard and bloated. She doesn't seem to be in pain. DH used Weedol on some of the weeds round here this afternoon, and it's possible she's eaten some grass - do I need to get her to a vet now, or will it be OK to wait till morning and see how she is?